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Things like permadeath; and energy is limited. The main base starts off with a little bit of coal, enough for a certain amount of time depending on how hard it should be. After that, it doesn't produce oxygen anymore. You need to fuel it with organic material and coal in order to survive. You would obviously have batteries and oxygen tanks in the main base which, after not generating any more oxygen could use those to help you not die. Depending on how hard it will be, the main base needs a different amount of energy, so that after a week you would be in constant fear of running out of fuel. Maybe that's an idea for later when Oil and Refineries exist, but I thought I'd just leave it here, maybe some of you think my idea doesn't suck.

You take a pod to Barren (the small moon around Terran). The pod has no functionality once on the ground. No terrain tool. No compound and resin in scavenger mode. Tethers do not help either since there is no infinite oxygen supply. Find titanium, copper, lithium and oxygen to survive (Already packaged) from crash sites of past Astroneers. Build tanks, batteries and generators. Organic packs, small solar panels, beacons, filters and hydrazine tanks can also be found at crash sites. One old rover can be found and recharged (No infinite oxygen with the rover, but you can store oxygen packs that you find on the back.) Storms and lack of oxygen can kill you (so find shelter at old crash sites or caves). Once dead, you have to restart and launch the pod again to Barren. Goal is to completely fill up an old shuttle (which needs to be found) with fuel and make it back home (to Terran). I think this game mode can be accomplished with the code that is in place (except for the rover, pod and shuttle not having infinite oxygen along with the absence of the terrain tool). Thank you

DEVS
I am currently playing build 0.2.111.0 and I love where you guys are going with exploration on the planet. Furthermore, the planet generation, whether it be caves mountains or hills, it is exciting and entrancing. There are, however, some problems I have with how we, as the player, shape the landscape. The deformation tool has a lot of potential to be not just a powerful tool, but a game altering one. There are a few ways that this tool could be more useful, not just for mining, but for base creation. A few examples:
Selection-multiple options (circle, square, poly, element)
Grids- Preferably this would be a toggle for both planetary and selected geometry.
Extrude-Be able to build an organic platform and raise or inset into the environment.
Alternate Sizes- Larger or smaller 'Brush' sizes for the Deformation tool.
Alternate Shapes- some standard geometric shapes for the Deformation tool. (square,star, hexagon, etc.)
Deformation Speed-Ability to alter the rate that the deformation tool smooths, flattens, or raises geometry.
Blueprints-Ability to save a certain amount of geometry to be placed over and over. (reasonable limits expected)
It is unfair to expect this much and not offer some thoughts for how this could be controlled or implemented. Already you have "E" bound to the tool by default, so reasonably, you could make it generate a menu by holding "E" for selecting the current mode or deformation you want (free up some of those easy to reach keybinds! \o/) and/or toggling the grids, changing "brush" shape/size, etc. Plunging deeper into that rabbit hole, holding a button and scrolling to increase/decrease the brush size (this will need some balancing for mining resources). For blueprint integration, creating a copy/paste mode that functions with the selection tool might be good.
To say that I enjoy your game so far is an understatement and I like where a lot of the game is heading. You can expect to see more posts from me about some more aspects of Astroneer. Until then, I have only to say, keep up the great work, and hopefully continue to enjoy working on it.
PLAYERS
For others reading this post, please feel free to voice your opinion on whether this interest you or not. If it does, be sure to let the devs know. If not, leave why, I am interested to see what your misgivings about it.

Thinking of a mode where you have infinite power in your backpack, and don't have to worry about dying of suffocation so you can explore the beautiful planets carefree, and experiment with the Terrain Tool, and what you can do with it!
Similar to Minecraft's creative mode, except I don't agree with the idea of infinite materials. Part of the joy of this game is getting them so I personally don't see the point!
so I call this "Exploration mode"!